7 Series - E65 / E66 (2002 - 2008)
This is for those who enjoy changing your own oil.
I have been buying Mobil 1 Oil @ WalMart for a number of years as they usually have good prices when compared to auto parts stores.
So, decided to check if they also sell 5W30 Castrol Full Syntheic and they do. A five quart container is $25...